单项选择题

Some birds like to sit on a sheep because______.

A．they can eat its parasites
B．they enjoy traveling with the sheep
C．they depend on the sheep for existence
D．they find the position most comfortable
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When is it cheaper to make an international call
A．10 a.m.
B．5 p.m.
C．11 p.m.
D．8 a.m.
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If you want to use your Business Telecard International, you have to
A．use a card phone
B．phone on Sunday
C．make a direct dialing call
D．pay extra
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